Melanesia is one of the twenty-two geographic subregions in which the UN divides the world for statistical purposes, and one of the four belonging to Oceania. It is composed of five countries: Fiji, Indonesia (West New Guinea only), Solomon Islands, Papua New Guinea and Vanuatu, and a territory that depends on France, New Caledonia.
Polynesia is one of the twenty-two subregions in which the UN divides the world, one of the four belonging to Oceania. It is composed of four countriesː Samoa, Tuvalu, Kiribati and Tonga and by many dependencies of Western countries such as French Polynesia, American Samoa, Cook Islands, Wallis and Futuna, Niue, Tokelau, Pitcairn Islands, Hawaii, Easter Island, Palmyra Atoll, among other.
Micronesia is one of the twenty-two subregions in which the UN divides the world, one of the four belonging to Oceania. It is composed of four countriesː Palau, Federated States of Micronesia, Marshall Islands and Nauru. It also includes three dependencies of the United Statesː Guam, Wake Island and Northern Mariana Islands.
The Mexican army attacked them. The main cause of the war was the westward expansion of the United States. All through the 19th century Americans believed it was their right to expand westward. At the time they believed they could conquer the people already living on the land and take it for the United States.
